Question 360220
Hello, 
First, understand what the letters stand for and then we can plug in the numbers.
 A=P(1+r)^t
2289.80=2000(1+r)^2
Expand this out to:
2289.80=2000(1+2r+r^2)
rewritten as:
2289.80=2000r^2+4000r+2000
Subtract 2289.8 from both sides:
0=2000r^2+4000r-289.80
Factor this or could use the quadratic formula to get:
{{{x = (-b +- sqrt( b^2-4*a*c ))/(2*a) }}}
Plug in the values to get:
7% interest.
Make sense?
RJ
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